Sanding machine



March 6, 1934. K. E. EDWARDS SANDING MACHINE Filed NOV. 1, 1932 '6 Sheets-Sheet l KEEJWarJs flllorney March 6, 1934., K EDWARDS 1,949,565

SANDING MACHINE Filed NOV. 1, 1932 6 Sheets-Sheet 2 Inventor fl Home y March 6, 1934. K. E. EDWARDS SANDING MACHINE 6 Sheets-Sheet 3 Filed Nov. 1, 1932 flllomey Mania 6, 1934. K: .5 EE D I 1,949,565

AAAAAAAAAAAA NE 4 By @W orney March 6, 1934.

K. E. EDWARDS SANDING MACHINE 6 Sheets-Sheet 5 Filed Nov. 1, 1932 March 6, 1934.

K. E. EDWARDS 1,949,565

SANDING MACHINE Filed Nov. 1, 1952 6 Sheets-Sheet 6 By fimm /I Home y Patented Mar. 6, 1934 lTE STATES FATE FFlC SANDING MACHINE 8 Claims.

The present invention relates to new and useful improvements in sanding machines particularly for use on picture frame mouldings but it is understood, of course, that the machine may be r used for any purpose for which same may be found adapted and desirable.

An important object of the invention is to provide, in a manner as hereinafter set forth, a machine of the aforementioned character embodying a novel construction, combination and arrangement of parts, thru the medium of which the sdes and top of one or more mouldings may be expeditiously and thoroughly sanded, the machine further being adjustable for operation on various sizes and shapes of mouldings.

Other objects of the invention are to provide a sanding machine of the character described which will be simple in construction, strong, durable, highly efficient and reliable in use, compact,

2G and which may be manufactured and installed or assembled at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views, and wherein:--

Figure 1 is a view in side elevation of a sanding 30 machine constructed in accordance with the present invention.

Fig. 2 is a view in top plan thereof.

Fig. 3 is a detail View in vertical longitudinal section through the feed rollers and adjacent portions of the machine. 7

Fig. 4 is a detail view principally in top plan, showing the drive mechanism for the horizontal sanding wheels.

Fig. 5 is a detail view in horizontal section, illustrating the mounting of the vertically adjustable feed roller.

Fig. 6 is a detail view in side elevation of the vertical sanding wheel.

Fig. 7 is a detail view in front elevation of the verticm sanding wheel with the sandpaper and supporting backs therefor removed.

Fig. 8 is a view in vertical transverse section through the machine, taken substantially on the line 8--8 of Fig. 2.

Fig. 9 is a view in vertical transverse section, taken substantially on the line 9--9 of Fig. 2.

Fig. 10 is a view in end elevation of the mechanism or unit which sandpapers the rabbetted sides of the mouldings, as illustrated in Fig. 9.

Fig. 11 is a detail view in elevation, looking at the other end of the unit shown in Fig. 9.

Fig. 12 is a detail view in top plan, showing the drive means for reciprocating the unit shown in Fig. 9.

Fig. 13 is a detail view in perspective of the vertically slidable sandpaper roll actuating rod.

Fig. 14 is a detail view in perspective, showing a portion of the mechanism for actuating the rod shown in Fig. 13.

Fig. 15 is a detail view in perspective of a portion of one of the guide assemblies.

Fig. 16 is a view in vertical transverse section, taken substantially on the line l6-l6 of Fig. 2.

Fig. 17 is a fragmentary view in vertcal longi- 7Q tudinal section through a portion of the vertical sandpapering wheel, showing the engagement of the sandpaper with a strip of moulding.

Fig. 18 is a detail view in front elevation of one of the flexible sandpaper supporting backs of the vertical sandpapering wheels.

Fig. 19 is a detail view in front elevation of one of the flexible sandpaper supporting backs of the horizontal sandpapering wheels.

Fig. 20 is a view in top plan of that portion of the table above which the vertical sanding wheel is mounted.

Fig. 21 is a sectional view through a portion of the vertical sanding wheel, taken substantially on the line 2121 of Fig. 6.

Fig. 22 is a detail view, showing the means for driving the unit shown in Figs. 9 and 10 of the drawings from the shaft of the lower feed roller.

Referring now to the drawings in detail, it will be seen that the embodiment of the invention which has been illustrated comprises an elongated table which is designated generally by the reference numeral 1, said table including a top 2 and suitable supporting legs 3. Adjacent its rear end, the top 2 of the table is provided with a transverse opening 4, and at spaced points, the table 1 is provided with transversely extending depressed portions 5 and 6. The reference numeral v8 designates a transverse main drive shaft which is mounted, as at 10, above the depressed portion 5 of the table 1. A pulley 11 is fixed on the shaft 8 and is connected to a suitable source of power by an endless drive belt 12.

Reference numerals l3 and 14 designate opposed upper and lower feed rollers which are mounted transversely on the table 1 at the opening 4 (see Fig. 3). the lower feed roller 14 being comparatively large and fixed on a transverse shaft 15 which also has fixed thereon a large pulleg 16. An endless belt 17 is trained over the pulley 16 and a small pulley 18 on the shaft 8 for operatively connecting said feed roller 14 to said shaft 8. The feed rollers 13 and 14 are provided with a suitable resilient covering 19, which is pref erably rubber, for providing a good frictional grip on the moulding strips which are designated by the reference numeral 20.

As will be apparent, the moulding strips 20 pass between the upper and lower feed rollers 13 and 14, being driven by the roller 14. The shaft 21 of the upper feed roller 13 is mounted in blocks 22 (see Fig. 5) which are slidably mounted in vertical slots 23 of uprights 24 which are connected at their upper ends by a transverse plate 25 which projects laterally beyond said uprights 24, as suggested in Fig. 2 of the drawings. Vertical screws 26 are journalled in the projecting end portions of the plate 25, and are threadedly engaged with the blocks 22 for adjusting the upper feed roller 13 vertically. Hand wheels 2'7 are fixed on the upper ends of the screws 26.

Guide strips 28 are mounted longitudinally on the top 2 of the table 1 on opposite sides of the opening 4 and also on opposite sides of the depressed portions 5 and 6 of said table top, one of said guide strips traversing the depressed portion 5, as seen in Fig. 20 of the drawings. The moulding strips 20 travel along opposite sides of the guides 28, as suggested clearly in Fig. 16 of the drawings. Also mounted on the table 1 on opposite sides of the opening 4 and the depressed portions 5 and 6 of the top 2 are guide assemblies or units which are designated generally by the reference numeral 29. As the assemblies 29 are similar, a detailed description of one will sufiice for all.

Each guide assembly 29 comprises a pair of bars 30 which are mounted for transverse sliding adjustment on the table top 2 in substantially U- shaped brackets or loops 31 which are provided for this purpose on opposite side portions of said table top. The bars 30 are secured in adjusted position by set screws 32 in the members 31. Vertical rollers 33 are journalled on pins which rise from the inner ends of the bars 30, said rollers 33 being engageable with the outer sides of the moulding strips 20. The rollers 33 cooperate with the guide strips 28 for retaining the moulding against lateral movement on the table 1. Rising from the bars 30 are posts 34 having mounted for vertical adjustment thereon horizontal arms 35 which are secured in adjusted position by set screws 36. Extending between the arms 35 is a transverse rod 3'7 which is secured in the openings provided therefor in said arms 35 by set screws 38. An elongated roller 39 is journalled on the rod 37 between a pair of collars 40. The roller 39 is engageable with the tops of the moulding strips for retaining said strips on the table top 2. The rollers 33 and 39 are preferably provided with a suitable resilient covering to prevent damaging the moulding.

The moulding strips are fed into the machine with the rabbeted sides thereof disposed inwardly against the guide strips 28, as best seen in Fig. 16 of the drawings.

Mounted on the table 1 forwardly of the feed rollers 13 and 14 is a rabbet sandpapering unit which is designated generally by the reference numeral 41. The purpose of the sandpapering unit 41 is to sandpaper the rabbeted or inner sides of the moulding strips. The unit 41 includes substantially U-shaped brackets 42 which depend from the table top 2 adjacent the ends of a longitudinal slot 43 which is provided in said table top. Longitudinal rods 44 extend between the brackets 42. A bar 45 is mounted for longitudinal sliding movement on the rods 44 through the medium of eyes 46 secured to the sides of said bar 45. The eyes 46, of course, slidably encircle the rods 44. The bar 45 is provided with upturned end portions 4'7 constituting standards which extend through the slot 43. Arcuate arms 48 are provided on the upper ends of the standards 4'7.

Longitudinal shafts 49 are journalledtin bear ings provided therefor on the free ends of the arms 48. The reference numeral 50 designates a web of sandpaper or similar material, which is windable on one of the shafts 49 from the other of said shafts 49.

The reference numeral 51 designates a rubber covered roller which is journalled between the lower portions of the standards 4'7 adjacent the bar 45. Also extending between the standards 4'7 above the roller 51 is a resilient backing or cushion 52 of suitable material, preferably rubber. The end portions of the cushion 52 are secured between pairs of the plates 53 which are mounted on the standards 4'7. Resilient guide rollers 54 are journalled in bearings 55 which are provided therefor adjacent the top of the cushion 52. The web of sandpaper 50 travels around the roller 51 and between the guide rollers 54 against the opposite vertical faces of the cushion 52 from one of the shafts 49 to the other of said shafts 49, as clearly seen in Fig. 9 of the drawings. As will be apparent, the web 50 operatively engages the inner sides of the moulding strips 20. Guides 56, similar to the elements 39 to 33, inclusive, are provided for maintaining the moulding strips in engagement with the web 50, and as will be apparent, the cushion 52 provides a resilient support for the portions of the web 50 which are engaged by the moulding strips.

The shafts 49 project beyond their bearings on the arms 48 and have fixed on one end ratchet wheels 5'7. Bell cranklevers 58 are journalled on the shafts 49 adjacent the ratchet wheels 57 and are operatively connected to said ratchet Wheels by oppositely disposed pawls 59. The bell crank levers 58 are coupled by a pin and slot connection 60 to the upper end of a rod 61 which is mounted for vertical sliding movement on the adjacent standard 47. An arm 62 rises from said adjacent standard 4'7 and has connected thereto one end of the coil springs 63 which are connected, at their other ends, to the pawls 59. The coil springs 63 are adapted to yieldingly maintain the pawls 59 either in operative or inoperative position, as suggested in Fig. 10 of the drawings.

Dogs 64 are provided for retaining the ratchet wheels 6'7 against retrograde movement. A horizontal arm 65 is fixed on the lower end portion of the rod 61 and is provided with a longitudinal slot 66 for the reception of a finger 6'7 which projects laterally from one end of a bell crank lever 68. The bell crank lever 68 is connected, at its other end, by a link 69 to an arm '70 which is fixed on one end of a rocker shaft '71. An arm '72 is fixed on the other end of the rocker shaft '71 and has pivotally connected thereto one end of a rod '73 which terminates, at its other end, in a fork '74 (see Fig. 22) which straddles the shaft 15 of the lower feed roller 14 for slidably supporting said other end of the rod '73 thereon. A laterally oifset roller '75 is mounted on the rod 73 adjacent the fork '74 for engagement by a cam 76 on the shaft 15 for connecting said rod '73 to said shaft 15 for actuation in one direction thereby. A coil spring 77 is connected to the arm 72 (see Fig. 1) for actuating the rod 73 in the opposite direction.

It will thus be seen that the shafts 49, through the meduim of the pawls 59, may be selectively operatively connected to the feed roller shaft 15 for actuation thereby. Reciprocation of the rod 61 rocks the bell crank levers 58 for actuating the shaft 49 which is operatively connected to its respective bell crank lever by one of the pawls 59, as suggested in 10 of the drawings. Thus, one of the shafts 49 will be actuated intermittently for winding the sandpaper web 50 thereon from the other shaft 49. Of course, this movement of the sandpaper web 50 may be reversed by simply reversing the relative positions of the pawls 59.

Fixed on the other end portions of the shafts 49 are brake drums 78 with which flexible bands or shoes 79 are frictionally engaged; One end of the bands 79 is permanently connected, as at 80, to the respective arms 48. The other ends of the bands 79 are adjustably connected, as at 81, to arms 82 which project from the arms 48. As may be apparent, the brake bands 79 retain the shafts 49 against idle rotation.

A pulley 83 is mounted on one end of the shaft 84 beneath the table 1. Fixed on the other end of the shaft 84 is a disk 85. A pitman 86 is connected off center to the disk at one end and at its other end to the bar 45 for reciprocating the unit 41 longitudinally on the table 1.

An endless belt 87 is trained over the pulley 83 and over a pulley which is provided therefor on the main drive shaft 8. The belt 87 is operable through an opening provided therefor in the depressed portion 5 of the table 2, as best seen in Fig. 2 of the drawings.

It will thus be seen that the crank disk 85 is driven from the main shaft 8 and that the pitman 86, which is attached to one end of the bar 45 of the sander 50, will reciprocate the sander and during the reciprocatory motion of the sander, the eye members 46 will slide on the rods 44 which are supported by the brackets 42.

Fixed on the shaft 8 above the depressed portion 5 of the table 1 is a vertical sanding wheel which is designated generally by the reference numeral 88. The wheel 88 is adapted to sandpaper the curved or substantially corrugated-upper sides of the moulding strips. The wheel 88 includes a hub 89 from which inwardly offset spokes 90 radiate. A comparatively broad rim 91 is mounted on the spokes 90, and provided with a series of circumferentially spaced, transverse slots 92. Angular arms 93 are secured, as at 94, to the hub portions of, the wheel 88, said arms being provided in pairs which extend radially from the hub portion of the wheel and having mounted between their free end portions shafts 95 upon which rolls 96 of sandpaper or similar material are mounted. Each roll 96 comprises a plurality of webs of sandpaper, a web being provided for each of the slots 92. The webs of sandpaper from the rolls 95 are drawn through the slots 92 of the rim 91, as clearly seen in Fig. 6 of the drawings. Also mounted in the slots 92 and projecting radially from the rim 91 are flexible or yieldable supporting backs 97 for the projecting end portions of the sandpaper webs. The backs 97 are provided with lateral projections 98 on their inner ends which retain said backs in the slots 92. The projections 98 are maintained in engagement with the inner periphery of the rim 91 by the action of centrifugal force which urges the backs outwardly in the slots. The outer end portions of the backs 97 are beveled to present a comparatively large area of sandpaper to the moulding strips and cut out, as at 99 (see Figs. 17 and 18), to conform substantially to the contour of said moulding strips.

After leaving the vertical wheel 88, the moulding strips encounter a pair of horizontal sand papering wheels which are designated generally by the reference numeral 100 which are operable in spaced, opposed relation to each other in the depressed portion 6 of the table top 2. The horizontal wheels 100 are of the disk type having a rim rising from the outer periphery of the disk, said rim being provided with vertical slots for the passage of sandpaper-strips from a single roll 101 which is mounted on the hub portion of each wheel 100. The sanding wheels 100 are provided with flexible backs 102 for yieldably supporting the projecting end portions of the sandpaper strips, said backs being substantially similar to the backs 97 with the exception that the free or outer ends thereof are plane for engagement with the outer sides of the moulding strips. The disks of the wheels 100 are disposed lowermost, the hubs upon which the rolls 101 are mounted rising from said disks. Each roll 101 includes strips of sandpaper, corresponding in number to the number of slots in the rims of said wheels 100.

The horizontal sandpapering wheels 100 are fixed on the upper end portions of vertical shafts 103 which are mounted in a frame 104 which depends from the table top 2. Horizontal pulleys 105 are fixed on the lower portions of the shafts 103 (see Fig. 4). The reference numeral 106 designates a transversely extending shaft which is journalled on suitable supports 1 07 beneath the forward end portion of the table 1. A pulley 108 is fixed on one end portion of the shaft 106. An endless belt 109 is trained over the pulley 108 and over a pulley 110 on the shaft 8 for connecting the shaft 106 to said shaft 8 for actuation thereby.

Pulleys 111 are also fixed on the shaft 106. Twisted belts 112 are trained over the pulleys 105 and 111 for connecting the shafts 103 to the shaft 106 for actuation thereby.

In operation, the moulding strips are placed on the rear end portions of the table top 2 with the rabbeted sides thereof engaged with the first guide strip 28. It will be noted that the guides 28 terminate at their ends substantially in points,

The leading ends of the moulding strips are also beveled or substantially pointed prior to the feeding of said strips into the machine. The mouldingstrips are gripped between the rollers 13 and 1 1 and frictionally driven forwardly in the machine past the unit 41 and the wheels 88 and 100. As the moulding strips leave the feed rollers 13 and 14, said moulding strips are pushed through the machine by the folding strips. As the mould ing strips pass the unit 41, the inner rabbeted sides of said strips are sandpapered.

As the moulding strips pass beneath the vertical sandpapering wheel 88, the upper sides of the said moulding strips are sandpapered and as they pass between the horizontal wheels 100,

the outer sides of the said moulding strips are l thoroughly sandpapered. In passing through the machine, the moulding strips bridge the opening 4 and the depressed portions 5 and 6 in the table top 2. It will be noted that the belts 112 are twisted (see Fig. 4) in a manner to drive the sanding wheels 100 in opposite directions and against the direction of travel of the work. Wheels similar to the wheels 88 may be used in lieu of the wheels 100 or vice versa.

It is believed that the many advantages of a sandpapering machine constructed in accordance with the present invention will be readily understood, and although the preferred embodiment of the invention is as illustrated and described, it is to be understood that changes in the details of construction, and in the combination andarrangement of parts may be resorted to which will fall within the scope of the invention as claimed.

Having thus described my invention, what I claim as new is:-

1. In a machine of the class described, a table, a guiding strip on the top thereof for engaging an edge of a work piece, a number of transversely arranged bars slidably arranged on the table top for movement toward and away from the guiding strip, a vertically arranged roller at the inner end of each bar for engaging the opposite edge of the work piece, means for holding the bars in adjusted position, a horizontally arranged roller for engaging a top part of the work piece,

and means for adjustably supporting each horizontal roller from a bar for movement toward and away from the work piece,

2. In a machine of the class described, a table, aligned longitudinally extending guide strips on the top of the table, pairs of transversely arranged bars slidably arranged on the table, one bar of each pair being arranged on one side of a guide strip and the other on the opposite side thereof, means for holding the bars in adjusted position, a vertically arranged roller at the inner end of each bar for engaging the outer edges of a pair of work pieces on the table, the inner edges of which engage the guide strips, an upright carried by each bar, an arm slidably supported on each upright, means for holding the arm in adjusted position, a shaft having its ends slidably supported in each pair of arms, means for holding said ends in adjusted position in the arms, a roller carried by the shaft for engaging the upper portions of the work pieces and means supported by the table and located between the guide strips for operating on the work pieces.

3. In a sanding machine, a table having a longitudinal slot therein, brackets depending from the table, guide means carried by the brackets, a reciprocatory member passing through the slot and having means at its lower end engaging the guiding means, a roller carried by the reciprocatory member and located in the slot, a pair of rolls supported at the upper end of said reciprocatory member, an abrasive strip having its ends connected with the pair of rollers, with a portion of the strip passing under the first mentioned roller, a block of resilient material carried by the reciprocatory member and located above the first mentioned roller, guiding means for the strip for causing portions of the strip to engage the sides of the block, a drive shaft supported by the table, means operated therefrom for rotating either one of the pair of rollers step by step to impart a feeding action to the strip, means for reciprocating the reciprocatory member from the drive shaft and means for pressing a part of a work piece against that portion of the strip which contacts a side of the block.

4. In combination, a wheel having a rim having spaced transverse slots therein, abrasive strips carried by the wheel and threaded through said slots and extending outwardly beyond the rim, and integrally formed flexible backing members for the strips movably arranged in said slots and extending outwardly beyond the rim.

5. In combination, a wheel having a rim having spaced transverse slots therein, abrasive strips carried by the wheel and threaded through said slots and extending outwardly beyond the rim, integrally formed flexible backing members for the strips movably arranged in said slots and extending outwardly beyond the rim, and projections on the inner ends of the members for limiting outward movement thereof.

6. In combination, a wheel having a rim having spaced transverse slots therein, abrasive strips carried by the wheel and threaded through said slots and extending outwardly beyond the rim, and integrally formed flexible backing members for the strips movably arranged in said slots and extending outwardly beyond the rim, each backing member having a portion of its outer end shaped to positively press a portion of a strip against that part of the work piece with which it engages.

7. In a machine of the class described, a wheel having a rim and integrally formed flexible members carried by the rim and transversely arranged thereon in spaced relation and extending outwardly beyond the rim and having their outer ends shaped to conform to that part of the work piece with which the members engage.

8. In a machine of the class described, a wheel having a rim and integrally formed flexible members carried by the rim and transversely arranged thereon in spaced relation and extending outwardly beyond the rim and having their outer ends formed with recesses shaped to conform to that part of the work piece with which the members engage.

KENION E. EDWARDS. 

